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Segment and Related Information - Narrative (Details)
$ in Millions
1 Months Ended 9 Months Ended
Apr. 30, 2018
USD ($)
Sep. 30, 2018
Segment
Business Acquisition [Line Items]    
Number of reportable segments | Segment   4
Kensho    
Business Acquisition [Line Items]    
Consideration transferred to acquire business | $ [1] $ 550  
[1] Excludes $112 million attributable to our redeemable noncontrolling interest.